[/B][B]I just bought an iPhone 4 online and had no idea that I couldn't update the baseband to the iPad one like with my 3GS. It's firmware 5.1.1 and the baseband is 04.12.01. Is it possible for me to downgrade the firmware to 4.1 and the baseband be downgraded too? Then I could update back to 5.1.1 using a baseband preserving custom firmware? Or is there absolutely no way for me to unlock it for free? It's locked to AT&T by the way.

Or would someone that's a current AT&T customer be willing to help me out? Any help is appreciated.

Sorry no unlock possible, for that BB.
Two options left.......one call AT&T to unlock it, but I don't think it will work, since their rules for unlocking these days are just sick.
Two...find an unlocking service, but it will cost you a lot.

[/B][B]I just bought an iPhone 4 online and had no idea that I couldn't update the baseband to the iPad one like with my 3GS. It's firmware 5.1.1 and the baseband is 04.12.01. Is it possible for me to downgrade the firmware to 4.1 and the baseband be downgraded too? Then I could update back to 5.1.1 using a baseband preserving custom firmware? Or is there absolutely no way for me to unlock it for free? It's locked to AT&T by the way.

Or would someone that's a current AT&T customer be willing to help me out? Any help is appreciated.

you can buy the official unlock with applenberry(expensive $150), however the phone can not on blacklist such as stolen other than that you will be ok.